高速铁路大跨度桥梁基于服役状态的健康监测指标研究

高速铁路基础设施的技术标准体系应涵盖基础设施的全生命周期,包括设计标准、验收标准和运营管理标准。对大跨度桥梁而言,风、温度、徐变、沉降等环境因素对结构性能影响显著,在设计与运营中均需考虑。在设计阶段,各类荷载均取最不利状态,在组合作用下仅要求结构满足强度要求,变形限值则是针对各类荷载单独给定的,未提出结构在实际运营状态多种荷载共同作用下的刚度要求,因此设计标准在结构的运营阶段不能直接采用。对比研究曲率半径、波长幅值以及弦长控制等方法在大跨度桥梁变形控制上的适应性,并以一座上承式拱桥为例提出健康监测指标限值的分析流程,可用于不同桥式和跨度的桥梁运营阶段静态变形控制。

Study on the Heath Monitoring Index of In-service High Speed Railway Long-span Complex Bridges

The technical standard system of high speed railway(HSR) infrastructure ought to cover the full life cycle of the infrastructure,including the standards of design,acceptance and operation.For long-span bridges,environmental factors like wind,temperature,creep,settlement which have marked influence on structural performance should be taken into consideration in design and operation.Various loads are in adverse situation in the stage of design,and it is required that structure should meet strength demand in combined action,while deformation limit is prescribed in accordance with various loads,and the stiffness requirements of the structure is not put forward.Therefore,the design standard cannot be adopted directly in the operation stage of the structure.The paper carries out a comparative study on the adaptation of radius of curvature,wave length amplitude and chord length to the deformation control of long-span bridges,and proposes the analysis process of health monitoring index limit by taking a deck arch bridge as example,which can be used in static deformation control in operation stage for different bridge types and spans.